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Passage Two
The African elephant, the largest land animal now alive, is in danger of extinction. The reasons are very similar to those in other cases of near – extinction; the beast is the source of a highly valued commodity – in this case, ivory – and the animal’s habitat(居住地) is being more and more fenced in by human settlements. East African elephants are most immediately threatened because they are victims of an illegal trade in ivory. At the same time, a growing human population has forced all African elephants back into once remote parks, where elephant density has in many cases exceeded the natural food supply.
26. The author suggests that the causes of animal extinction are _____.
A. peculiar to each group of animals
B. similar in most cases
C. dependent on the climate in which the animal lives
D. dependent on the size of the animal
27. The author implies that an animal is more likely to become extinct if it _____.
A. is far from human settlements
B. is native to East Africa
C. is a large land animal
D. produces something of value to human beings
28. Which of the following has most seriously affected the African elephant?
A. Its large size.
B. The lowered reproduction rate.
C. The expansion of human settlements.
D. The changing climate.
29. The East African elephant may become extinct sooner than other African elephants because of ______.
A. an unlawful ivory trade B. the high cost of fences
C. the remoteness of its habitat D. its huge size
30. The major problem facing elephants forced to live in limited areas is the _____.
A. danger of rapid reproduction
B. illegal ivory trade
C. scarcity of food
D. competition with other animals for space
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